For me, it takes a lot of conditioner to coat my hair (i have lotsa hair). It's like impossible for my hair to be overconditioned or weighed down. I'd say my hair is generally dry so it can "take in" loads of conditioner. Also I can use heavy conditioners daily and even use them as a leave-in and not have any problems. hope this helps

my hair changes everytime i wash it. sometimes it needs a little sometimes lots. thing is when i first smooth conditioner over my hair it feels like its totally been absorbed into my hair. but when i comb it through i can really see how much has been absorbed. it usually sits on top so i can see why stuff on my hair but a minute later will be gone - voila its been drunk up by my hair! so i'll apply a little more (2 pea sizes worth) and then wait a minute. if its gone i'll apply more until my hair feels seaweedy and looks really shiney. if i keep applying unitl i can see conditioner on my hair that isnt absorbed then i have overconditioned. so i dont put enough on that i can see the conditioner on my hair without it being absorbed, i apply enough that its all absorbed and feels really seaweedy.

Hope that made sense! its a fine line but once you crack it your hair will love you